Budget chrono with a difference...

[Stix]

No...
I know how to tighten it..

It slides when it is as tight as you can get it...

Its a pain...i regret buying it to be honest...!!

[Bill]

You gotta tighten the strap itself and then use the knob to tighten it even more. Pretty easy to tighten it enough that you cannot budge it even if you use full force

this ^ you must back the tightening knob off completetly then tighten the strap, then knob away even tighter. Bloody fool proof, havent tried with a cerakoted barrel or stainless yet but I doubt coating would make stuff all difference.

[Bill]

No...
I know how to tighten it..

It slides when it is as tight as you can get it...

Its a pain...i regret buying it to be honest...!!

you didnt get gun oil off the barrel impregnated into the rubber block by chance ?

[Sergeant Hartman]

Idd put a bit of tape before and after the strap and see The movement then.

I have it on smaller calibres like 223 upto 338 and no movemento

[Stix]

I know i look stupid...but i dont lube the barrel...it slides regardless of how tight or how much oil...

Ive built a couple of cars in my time, & was the go to mechanic for all friends & family in my 20's, so i know how to, & when to tighten a nut...

I strap various things like timber down on my roof for the last 20 years with those straps, so i know how they work...

Also the strap has a memory which doesnt help...

It slides regardless & needs to be monitored...

You will not fire 6 shots out of my 7-08 & not have it move atleast half inch...not to mention the load that groups .25" with single figere SD with the Magneto strapped to the barrel, opens up to an inch with a different POI when the Magneto is removed...

Its an obvious, but inefficient system for securing to a barrel....period...if you dont believe me...ill happily swap you...

[Bill]

fair enough stix, sounds like you need to go hunting with it on

Chrronographs are for load development, obviously you should be checking group point of impact afterwards.

Not sure why groups would quadruple in size ?? that make zero sense for a huntng rifle

[TassieTiger]

fair enough stix, sounds like you need to go hunting with it on

Chrronographs are for load development, obviously you should be checking group point of impact afterwards.

Not sure why groups would quadruple in size ?? that make zero sense for a huntng rifle

Don’t some rifles benefit from various additional weights / add ons, added to various pArts of the barrel, as they can reduce harmonics and improve accuracy ?

[Bill]

no idea TassieTiger, but if you could grab a rubber thingo and slap it on ya Hunting rifle barrel and it actually reduced groups size by 75%......

Well gunshops would be selling heaps of them .....

[Stix]

Ofcourse there are things that do that...barrel tuners..

There is a mob that makes rubber type doova thingam'jiggo's, but no one wants them on a hunting rifle...
So its just about finding another load & only use the magneto for velocity of that load, rather than use it to find a load...

But im not going to bother with an argument about barrel harmonics as im no expert...i just made a factual statement from my experience...that obviously aligns with others' experience with the magneto...that it can, & does often change the POI & have an influence on barrel harmonics...

I dont see how this is so hard a point to grasp...

Anyway...moving on...

[marksman]

its not really that hard to understand that if you have weight on a barrel especially a thinner barrel your harmonics will change when the weight is taken off, the barrel cant ring at it's natural frequency which you take advantage of when you are "working up a load"

nobody would expect a barrel to perform the same if it was touching somewhere along the barrel and IMO its the same principle
who says that the magnetospeed is put on perfectly at 6 o'clock every time or that your barrel was clocked properly when fitted
it make sence to me that there could be changes

the straps l am talking about are the original straps that didn't have the nut ect.. it was just a clamp and they all slipped to the point that some of the guys who had them were sending them back for a refund that why they made the change
IMO a clamp would be better but they would have fun trying to produce one size fits all and it is more weight

since l have been using the satterlee technique l do use a pro chrono for load development before doing OCW testing
but before it was after l did load development with OCW testing that l checked speeds, es ect... this always worked out for me
if l were to use the magnetospeed l would be checking for flat spots then taking it off to do OCW group tests then check speed ect after
just how l would use it

[Stix]

Marksman...ive never understood the "flat spot" theory...makes no sense to me...
I think i saw it explained how i understand it to not be useful somewhere in one of the links you once posted...

If you fire a string of shots at steadily increasing charges & look for a flat spot, you will find one, or 2, or 3......but who is to say that is an actual flat spot, & not the extreme ends of say a velocity scatter node...??...(not sure if thats a term, but hopefully you know what i mean)...

Ive tried it once before & chased my tail pointlessly...wasted a heap of time & money chasing a load where there wasnt one, well i dont think there was one, lost all confidence in what i was doing, so just went back to what printed at 100 & shot things...

[Sergeant Hartman]

Good point marksman, i didn't think about thin barrels, probably could case more issues.

When it moves what effect does it have on the speeds

[marksman]

Marksman...ive never understood the "flat spot" theory...makes no sense to me...
I think i saw it explained how i understand it to not be useful somewhere in one of the links you once posted...

If you fire a string of shots at steadily increasing charges & look for a flat spot, you will find one, or 2, or 3......but who is to say that is an actual flat spot, & not the extreme ends of say a velocity scatter node...??...(not sure if thats a term, but hopefully you know what i mean)...

Ive tried it once before & chased my tail pointlessly...wasted a heap of time & money chasing a load where there wasnt one, well i dont think there was one, lost all confidence in what i was doing, so just went back to what printed at 100 & shot things...

usually Stix when l have done the OCW testing the results mirror the satterlee as in finding a flat spot in velocity shown by usually low es
so now l do the satterlee test beforehand with a target then based on that l do the OCW and know l am going to get the velocities
l have always said you dont need a chronograph to get a sweet spot load but it helps with the way l am doing it now,
gets you where you want to be testing quicker

l still cannot remember who on this forum it was that asked about the satterlee testing that pricked my interest

[TassieTiger]

I noted a flat spot when recently testing the 300...
I had decent accuracy from 66gns and 68gns and then 69.5gns test loads.
Using this chrono, I noticed that 68.4gns and 68.6gns - didn’t increase any speed from 68.0...had me scratching my head and wondering if I had not screwed up - so I replicated the same and got same results. For some really weird reason, some loads of 68.4 produce equal or even slower than 68.0.

I’ve tested this up to 72.0gns but there is a node at 66 and 68 and it’s just about right on 2850 and 3k respectively. I am getting inconsistencies up to 69.5gns. But 69.5 at this stage (no seating depth play) is not quite as accurate as 68. Over 69.5 and I seem to get a drop off in speed again and then flyers start coming in. More development to be done...

[marksman]

Good point marksman, i didn't think about thin barrels, probably could case more issues.

When it moves what effect does it have on the speeds

l dont really know if the strap sliding had any effect on speeds but the bayonet would droop so l dont think it would be working as it should
the manufacturers made the better strap catch set up pretty quickly because of the complaints

[Bill]

If the bayonet was drooping then you had buckleys of getting an accurate reading.

Took my magneto to the range yesterday and 30 rounds thru the heavy recoiling. 6.5 grendel it didn't shift 1 bit. 0.6moa 5 shot groups was as good as the gun has ever fired to, am yet to see any accuracy affect.

[Stix]

Bill...i get that if its not happening for you its not happening...
But im not shooting your 6.5...

And i dont get a shift in poi or change in group size with my heavy barrel 22-250 either...

Thing is, there is not much steel around the 7mm hole in my sporter barreled 7-08....so its understandable it probably whips around a little...

[Sergeant Hartman]

Hey stix is yours a sporter or the v3 one? Got a friend interested if you want yo let go for cheap, seeing it doesn't work that well

[Stix]

If i sound a bit abrupt above--i didnt mean to be..

.It works Ziad...and what do you call "cheap"...

And i must say, i think your attempt to subliminally convince me it doesnt work so your friend can get it cheap is pretty funny...

Yes its the V3...

But...doubt ill off-load it, because i cant afford any different options...
I just have to use it within its capabilities...but that doesn't stop me having a bitchy whine about it...

[Sergeant Hartman]

I am happy to swap my sporter for your v3 with a couple of cans of XXXX Gold your way.

Or just use a thicker rubber riser and increase your sensitivity as it might be a couple mm away from the barrel