Weird marks on my target paper
- Thread starter serbinator
- Start date
I've seen those swiriies using plated bullets out of IPSC open guns. I'm one for the theory that the bullet base is somehow disintegrating, ablating...shoot lower velocities or get different bullets if you don't want the swirls..
No idea how that affects barrel wear or final accuracy. Bench some and let us know how it turns out!
No idea how that affects barrel wear or final accuracy. Bench some and let us know how it turns out!
1) Why the magnum primer on a 30/06?
2) Why would you pay for a premium barrel (and I assume installation) to run cr@p through it?...
3) We see this in IPSC when driving bullets too hard. With 160PF in open you don't see it as much now but try to drive a plated 9mm to 1400+fps and the bullets come apart...
I would suggest;
-Clean the bore and chamber thoroughly.
-Buy jacketed bullets, or
-Get a Lyman's manual and find an alternate powder/load to drive these much slower.
2) Why would you pay for a premium barrel (and I assume installation) to run cr@p through it?...
3) We see this in IPSC when driving bullets too hard. With 160PF in open you don't see it as much now but try to drive a plated 9mm to 1400+fps and the bullets come apart...
I would suggest;
-Clean the bore and chamber thoroughly.
-Buy jacketed bullets, or
-Get a Lyman's manual and find an alternate powder/load to drive these much slower.
1. its in .308 and it was the only large rifle primers i could find.. and cci magnum primers are closest spec to the military primers
2. its criterion barrel? came with the gun, not a krieger.
3. i cleaned it thoroughly before and shot it after and i didnt get any more swirl marks.
4. i shot hornady 150gr FMJBT through the gun and those performed fine.
im gonna bench rest shoot some 37-40gr frontier reloads this weekend and see how it goes, i just got some benchrest bags in so i can do a proper test at 50 yrds.
It's lead, not powder. Plated bullets use cast bullet data. Plating is likely coming off due to excessive velocity(you're nowhere near max velocities.).
Key holing doesn't look like that.
However, 37 or 38 grains of H4895 is way under minimum for a jacketed 155 grain bullet. H4895 is not a cast bullet powder. Cast bullets out of a .30-06 use shotgun and pistol powders. Typical cast bullet velocities run under 2000 FPS with MAX loads. You cannot make up your own data. There is a possibility of the powder actually detonating vs burning.
CCI magnum primers are no more milspec than their #34 primers are. You do not need magnum primers for H4895(or IMR4895). Them being the only ones you could find are another thing though. Nothing bad will happen, you just don't need 'em. Maybe a bit higher pressures with jacketed bullets, but you're under minimum(43.0 for a jacketed 155) already and that's bad enough.
Key holing doesn't look like that.
However, 37 or 38 grains of H4895 is way under minimum for a jacketed 155 grain bullet. H4895 is not a cast bullet powder. Cast bullets out of a .30-06 use shotgun and pistol powders. Typical cast bullet velocities run under 2000 FPS with MAX loads. You cannot make up your own data. There is a possibility of the powder actually detonating vs burning.
CCI magnum primers are no more milspec than their #34 primers are. You do not need magnum primers for H4895(or IMR4895). Them being the only ones you could find are another thing though. Nothing bad will happen, you just don't need 'em. Maybe a bit higher pressures with jacketed bullets, but you're under minimum(43.0 for a jacketed 155) already and that's bad enough.
Brutus
CGN Ultra frequent flyer
Be VERY careful here sunray. I once also thought this was true and was rewarded with a plated bullet stuck in the muzzle of my rather nice S&W revolver.
This terrible result, from using cast lead pistol bullet data with electroplated bullets.
Brutus
CGN Ultra frequent flyer
Respectfully Serbinator, I think you found the source of the problem already. May I suggest the continuing use of the frontier bullets is a waste of your time/primers/powder.
If I were you my friend, I'd just forget about the plated F bullets and carry on to something else with a real metal jacket of some sort.
Cheers!
my garand is 308, magnum primers were the only ones i could get so i got 2k of them. My hornady book says for 150gr bullets recommended starting charge for H4895 is 37.2gr and max load is 42.9gr (.308 winchester service rifle load data)
frontiers shot fine after i fully took apart the gun and cleaned it
, i think it was just too much fouling,i was experimenting with norinco surplus light loads, the norinco ammo was around 41.5-42 gr from the factory and i was trying them out at around 37-39 gr. didnt perform as i expected as they had a lot of fouling left in the chamber and on the case which makes me believe that shooting the frontiers after that norinco caused the frontiers to not perform properly. since cleaning it, i have put about 40 rounds down the pipe and no issues. i think the light loads are causing my groups to be bad so im gonna ramp it back up to 40gr and see how they perform benchrest.Sunray is more-or-less correct. In the majority of situations, you can use cast data for plated bullets.Be VERY careful here sunray. I once also thought this was true and was rewarded with a plated bullet stuck in the muzzle of my rather nice S&W revolver.
This terrible result, from using cast lead pistol bullet data with electroplated bullets.
I have also gotten a plated bullet (Berry's) stuck in the bore while using cast data. It was a Marlin 1894 in 44 mag. When going on the lower end of things, you always have to be careful regardless of plated or cast. In my case I was using low-end 44 special data in a 44 magnum case in a rifle. In the mid to upper end of the cast data range (as in velocity, not data for one specific powder) the two can be interchanged the vast majority of the time.
When playing with low velocity loads, be sure to check the bore after each shot if there isn't a distinct new hole on the target.
appreciate the advice, i double checked with frontier directly and the distributor and they both assure the plating on the 308 rounds is enough that it can withstand standard 308 velocities. now that i know how the gun performs at 37 gr of powder ill be ramping it back up to a medium load at 40gr. i havent had a chance to test it at 100 yards yet but the light loads at 50 yards were shooting just a bit below the top of my front sight.
