JohnV wrote:My 22 Brno can hold 1 inch at 100 meters the last time I shot it that is , from a bench using a rest and rear bag . It may need the bedding redone because it's sat in the safe unfired for years . Zeroed for 300 I could hit the 6 and 8 inch gong at 300 as long as there was no wind . Cross wind is the big killer for a 22 rimfire . Another problem is the trajectory angle coming down at 300 makes it harder to hit them than it appears . The danger space is reduced compared to a flatter shooting cartridge . Can I just bring my 223 lol.
wildcard6 wrote:Bladeracer, you're spot on. In summer the backstop shows impacts quite well but sometimes there's no indication at all and I deduced that the bullet went just over the top, but hit the dirt right behind the target. Spotters to the side think the bullet went through the window (ram targets).
I once shot a 200 yard paper target match using 200m dope and I had a nice group 200mm above my point of aim!
bladeracer wrote:JohnV wrote:My 22 Brno can hold 1 inch at 100 meters the last time I shot it that is , from a bench using a rest and rear bag . It may need the bedding redone because it's sat in the safe unfired for years . Zeroed for 300 I could hit the 6 and 8 inch gong at 300 as long as there was no wind . Cross wind is the big killer for a 22 rimfire . Another problem is the trajectory angle coming down at 300 makes it harder to hit them than it appears . The danger space is reduced compared to a flatter shooting cartridge . Can I just bring my 223 lol.
If you can see the impacts of your misses you only need one shot to read the wind, make the adjustment, and you shouldn't have any trouble hitting the gongs. I rarely have such feedback shooting on grass, so I have a gong set up at 100m-ish for a wind read to save ammo when extending further.
At 300m the trajectory is about 22mm drop per meter of distance, a little over one-degree from horizontal. At 500m it's coming down at about 2.5 degrees from horizontal. At 700m it's dropping at almost 100mm per metre. It's worth knowing this as I'm often shooting at hill slopes rather than purpose-made berms. If you see a splash of dirt just off the right edge of the gong you might think your elevation hold is perfect. But if the slope is such that the bullet actually hit the slope 5m behind the gong, then it probably sailed overhead and you need to drop 100mm off your elevation hold as well.
Peterwho wrote:bladeracer wrote:At 300m the trajectory is about 22mm drop per meter of distance, a little over one-degree from horizontal. At 500m it's coming down at about 2.5 degrees from horizontal. At 700m it's dropping at almost 100mm per metre. It's worth knowing this as I'm often shooting at hill slopes rather than purpose-made berms. If you see a splash of dirt just off the right edge of the gong you might think your elevation hold is perfect. But if the slope is such that the bullet actually hit the slope 5m behind the gong, then it probably sailed overhead and you need to drop 100mm off your elevation hold as well.
Blade, Have I misunderstood the last paragraph? 300m x 22mm = 6600mm or 6.6m. This seems high to me. I’m tempted to do a 300m shoot at Kariong for 22lr on the weekend and would appreciate any guidance offered. Many thanks Peter
madang55 wrote:and.........what MOA rail are we talking. I know I'm going to need a handle on the top turret to wind that much with a 0MOA rail.
bladeracer wrote:The simplest and cheapest adjustable rail is around $100 I think. It's a two-piece rail (with or without rings). The rings attach to the top piece of the rail, which is held above the bottom piece which is fixed to the rifle. You adjust screws between the two pieces to centre the windage and zero with the turret fully down. You have to shoot a group, remove the rail, adjust the screws, reinstall, shoot another group, and so on. It does take time but once you have it set up you shouldn't need to touch it again ever. You should be able to do it in less than ten tries, even less than five sometimes. If you have a lathe you could use over-size rings, say 35mm or 40mm and machine offset inserts to add cant to the scope, but I think this would be even more painful to zero. Or you can buy a fully adjustable rail with click adjustable windage and elevation, but these are in the realm of $700 to over $1000. In between those you can use the adjustable rails that are marketed toward setting up digital scopes for around $200. This is what I'm using currently, once you're zeroed you don't need to touch them again, but you can zero these with just two or three groups much like zeroing any scope conventionally, shoot a group, mark the mean centre, dial the mount to move the reticle onto the mean centre, fire another group to confirm.
madang55 wrote:See, now that's what I call information. I've downloaded, printed and laminated and will start working on it. I don't think I will need to go to adjustable rails, just the 30. Zero at 50, dial to 200 and get some practise started. All I have to do is find a 30 rail suited to my CZ.
Cheers
madang55 wrote:PM'd you. Actually the 3rd option is available on that site now for $139 plus delivery. If it works on my CZ, might be a winner.
madang55 wrote:Great stuff. Did you manage to get the mount with the 200mm rail? Same website?
gunderson wrote:I used to stuff about shooting a gong 250ish meters with the 22lr, standard velocity rounds, didnt have a big minute picatinny rail or anything so the holdover was interesting haha..
bladeracer wrote:Got some gear from STS today, 4", 6" and 8" gongs for practicing the Long Gong, and a rimfire Know-Your-Limits set.
Have to weld up some hanger frames for them now.
madang55 wrote:Very cool. I will keep to getting on paper consistently. If that works I will look at getting more adventurous. Mt CZ loves the Eley and Fiocchi out to 75m, so hopefully they will behave at 200. I have also just found a stock maker in Geelong so I will be getting some bedding done.
wildcard6 wrote:For anyone wanting to shoot Long Gong and record scores, I put a WORD document on the Long Gong Facebook group page that can be printed as an A4 page with room for five shooters per page. Each shooter has five lines for scoring. A week from today is the monthly XRRS shoot at Para range in Adelaide and after the main match we have what I call a 'Chaser' shoot - something a little different that adds variety - and this month will be a few rounds of Long Gong. We'll be shooting it at 200 METERS instead of 300 yards to get people used to shooting it and to give a better chance of hitting even the smallest gong. It's for fun, not serious competition.
bladeracer wrote:I did download the scoresheet but I haven't actually tried shooting the ten-round competition yet, still just concentrating on getting hits.
Just heading out to my mate's place for another practice so I'll try 200m first and see how that goes.
Forecast was for 36C I think but it's only 23.4C under the veranda currently (1130) and doesn't feel as warm as yesterday. But there's zero breeze where I am, I'm hoping it'll be the same at his place.