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It turns out that Hornady suggests that one seat their GMX bullets at least 0.050" off the lands to avoid high pressures. Who knew? | |||
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For what its worth flat primers alone are a poor indicator of pressure, Ive seen flat primers with the mildest of loads and even with some factory rounds...It is an indication to proceed carefully, nothing more nothing less, but when combined with other pressure signs its then an indication...Your next sign will probably be an extractor square shiny spot on the case head, a black ring around the flat primer, followed by a slightly sticky bolt, time to cut back a grain or two..If you get to a stock case, separated case or a crack as opposed to a boom, son your in trouble!!  those pressure indication may come in different order, but not usually..and one should use a chronograph to back up these signs of pressure..Use new brass when working up loads, and as they age by shooting keep and eye out as you may need to drop a grain at some point and anneal or just keep them for mild target loads or toss them for that matter. I keep my brass separated as to the number of firings and manufacturer.. I tend to load warm to hot as unfortunately that's usually where the best accuracy is found, and helps with trajectory and maybe even killing effect on game, contrary to some reports that milder loads are more accurate, that depends entirely on the gun itself, and it can go either way..Keep in mind that not much is written in stone with reloading. No need to be perinoid, as the signs are there, just use common since. Ray Atkinson Atkinson Hunting Adventures 10 Ward Lane, Filer, Idaho, 83328 208-731-4120 rayatkinsonhunting@gmail.com | |||
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you don't need permission to load photos Mike Never under estimate the internet community's ability to reply to your post with their personal rant about their tangentially related, single occurrence issue.  What I have learned on AR, since 2001: 1. The proper answer to: Where is the best place in town to get a steak dinner? is…You should go to Mel's Diner and get the fried chicken. 2. Big game animals can tell the difference between .015 of an inch in diameter, 15 grains of bullet weight, and 150 fps. 3. There is a difference in the performance of two identical projectiles launched at the same velocity if they came from different cartridges. 4. While a double rifle is the perfect DGR, every 375HH bolt gun needs to be modified to carry at least 5 down. 5. While a floor plate and detachable box magazine both use a mechanical latch, only the floor plate latch is reliable. Disregard the fact that every modern military rifle uses a detachable box magazine. 6. The Remington 700 is unreliable regardless of the fact it is the basis of the USMC M40 sniper rifle for 40+ years with no changes to the receiver or extractor and is the choice of more military and law enforcement sniper units than any other rifle. 7. PF actions are not suitable for a DGR and it is irrelevant that the M1, M14, M16, & AK47 which were designed for hunting men that can shoot back are all PF actions. 8. 95 deg F in Africa is different than 95 deg F in TX or CA and that is why you must worry about ammunition temperature in Africa (even though most safaris take place in winter) but not in TX or in CA. 9. The size of a ding in a gun's finish doesn't matter, what matters is whether it’s a safe ding or not. 10. 1 in a row is a trend, 2 in a row is statistically significant, and 3 in a row is an irrefutable fact. 11. Never buy a WSM or RCM cartridge for a safari rifle or your go to rifle in the USA because if they lose your ammo you can't find replacement ammo but don't worry 280 Rem, 338-06, 35 Whelen, and all Weatherby cartridges abound in Africa and back country stores. 12. A well hit animal can run 75 yds. in the open and suddenly drop with no initial blood trail, but the one I shot from 200 yds. away that ran 10 yds. and disappeared into a thicket and was not found was lost because the bullet penciled thru. I am 100% certain of this even though I have no physical evidence. 13. A 300 Win Mag is a 500 yard elk cartridge but a 308 Win is not a 300 yard elk cartridge even though the same bullet is travelling at the same velocity at those respective distances. | |||
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Then you are are just over complicating things. Any animal you can kill with the 260 can just as easily be killed by the 243. Under hunting conditions, a rifle that shoots 1 inch groups is going to be just as good as one that shoots 2 inch groups. No animal is going to tell the difference in velocity if you hit him in the right place. I admire your persistence, we have all done what you are doing. Nothing wrong with that at all. But, I just think you’re wasting time, ammo and wear and tear on your rifle. | |||
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Epilogue So, this is what I ended up doing: I sent the rifle back and had the throat reamed out 0.050". And then I seated the hard (solid copper) bullets 0.050" from the lands and the regular, lead core bullets 0.020". The pressures and velocities are back to normal. On a side note, I've found that seating the bullet farther from the lands reduces velocity. | |||
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