Medic wrote:Hey guys,
So I had a bolt 223 that I could shoot up to 15.5 grains of AP100 in for a velocity of 3100 with a 55grain pill.
I backed it off to 14.5 for an overall 2950 average safely and consistantly in my howa 1500.
I worked up similarly in my remington pump 7615 today and noticed massive ejector marks, stuck cases, blown primers. I've tried different COAL that had a marginal effect but honestly, what could be causing this?
I have another load of 18.5 grains 2205 which not only hits 3000fps but also cycles and AR. I thought I might go back to it because its a bit lower pressure, but i have 2kg of AP100.
The 308 runs just fine with 32 grains of 2205 @ 2450 (125grain tnt) or 22/23 grains AP100 @ 2250. Great loads for plinking and hunting particularly if you shoot alot which is almost always with a pump. Those loads were the same and ran fine in a 308 bolt.
So yeah, what the hell is with the 223. It over pressured so much it stuck the ejector back, I gotta pull it apart and fix it. What the hell? How can the chamber be so damn different???
Ideas?
P.s: I do these downloads because its MUCH cheaper to shoot and I shoot ALOT. They still smack things at 2750FPS so yeah, I wanna stick with them. Ideas?
Oldbloke wrote:Remington pump 7615 might be rear locking?
If so that would explain it.
bladeracer wrote:Oldbloke wrote:Remington pump 7615 might be rear locking?
If so that would explain it.
While I don't disagree, I do wonder why a rear-locking bolt would relate to increased pressure in the chamber.
My Remington 788 was a rear-locking bolt and while very hot loads did cause excessive case stretching I never saw any pressure signs.
Oldbloke wrote:bladeracer wrote:Oldbloke wrote:Remington pump 7615 might be rear locking?
If so that would explain it.
While I don't disagree, I do wonder why a rear-locking bolt would relate to increased pressure in the chamber.
My Remington 788 was a rear-locking bolt and while very hot loads did cause excessive case stretching I never saw any pressure signs.
Perhaps some are better than others.
Supaduke wrote:The real question is why are you using pistol powder in a rifle? Regardless of results that strikes me as foolhardy. I guess 10 is too many fingers.
bigpete wrote:Usually has something to do with a seal. Try shaving your pubes and see if that helps
bigpete wrote:Usually has something to do with a seal. Try shaving your pubes and see if that helps