I have a Remington 700 long range chambered in 300 win mag. I mounted a scope on it bought some factory ammo for it and took it to the range. The factory ammo I bought for it were the Barnes 180gr TTSX. I shot two rounds through it with the bolt sticking on both shots. I stopped shooting and noticed that the brass is rubbing just above the belt. Anyone have any advice as to why this would happen? Is it an issue with the Barnes bullets or an issue with the gun? I did reach out to Barnes, and I sent them several pictures and lot number of the ammunition but have not heard anything back.
300 Win mag brass swell
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ShtrRdy
Well-Known Member
Did you clean and swab out the chamber / neck area before firing?
If you have a caliper measure the diameter a little above the belt.
If you have a caliper measure the diameter a little above the belt.
Is the rifle new?
Yeah I cleaned the barrel after. It was a little dirty but didn't seem out of the ordinary. That's a good idea I will measure it. The rifle is not new, it was strange to me. I did take it out today and it shot a few federal premium scirocco ii perfectly fine. Must have been the Barnes bullets?
What reamer did you use.
Or is this factory chamber?
Or is this factory chamber?
It is factory
I have some barrels that act weird if they havnt been shot in awhile. Maybe the carbon in the barrel causes pressure and it always seems to go away after 3-5 shots.
As mentioned. Some barrels take more rounds to brake in. You may have to shoot a few rounds then clean real well and repeat. Most barrels need a minimum of 25 and up to 100 rounds for it to settle in.
I let the barrel tell me. Pure copper, depending on the type can create more pressure then the Cup and Core.
Hope this helps.
I let the barrel tell me. Pure copper, depending on the type can create more pressure then the Cup and Core.
Hope this helps.
Western4444
Well-Known Member
Carbon in the chamber. Really clean it, suggest Even honing it using honing paste.
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Any chance you have a bore scope? Might tell you if there is a burr in the chamber, carbon ring, etc...
Odd that another ammo doesn't have the same issue.
K.E.C makes a good point, might be the harder mono bullet. Might also be due to guilding metal not playing nice with the mono bullet. Perhaps clean to bare metal and try again.
Odd that another ammo doesn't have the same issue.
K.E.C makes a good point, might be the harder mono bullet. Might also be due to guilding metal not playing nice with the mono bullet. Perhaps clean to bare metal and try again.
My Seekins 300 WM has about 500 rounds on the barrel. It was showing some signs of pressure. Velocity for a load with 215 Bergers was running around 2965 fps. I bought a Teslong flexible bore scope and some Bore Tech C4 and some Iosso paste off of Midway thinking I might be dealing with a carbon ring. I cleaned it really good and the pressure spike went away and velocity dropped to the normal 2915-2920 FPS. It may have been your Barnes ammo, but carbon rings can cause havoc as well!
Before and after cleaning pics attached showing carbon buildup.
Before and after cleaning pics attached showing carbon buildup.
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I've experienced issues with Barnes ammo before. They tend to load it to max performance. I've seen new 300 Rum brass that wouldn't hold a primer after one shot. I contacted Barnes and their answer was, well someone overloaded it. Yeah, they did.
Barnes had Hornady make there brass at one time. Can't remember who makes it now. As mentioned 1 firing and the brass was Junk.
