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300 blackout bullet diameter ?
varian
Member Posts: 2,257 ✭✭✭✭
have a 10 inch barrel on a 300 blkout .308 groove dia. i see some lead, coated bullets for sale that are .310 dia 145gr. they are advertised suitable for the 300 blkout. is there any problem using this dia bullet other than maybe changing the neck expander ball in my die. these are just for plinking use.
Comments
The general rule for lead bullets in modern cartridges is one-to-two thousands over groove diameter, per the Lyman Reloading Handbook. I have no experience loading lead rifle bullets.
Those are usually for the 762 x 39 not the 308
.310" should you choose to use them, should not be pushed hard, since, as has been stated, that is more suited to the eastern bloc rifles bore. Fouling will increase as well.
If they are copper "washed" and not plated, it is a thinner coating and will conform more easily to the rifling, but discretion is always the better part of valor. Double check to see how the copper is applied. If the jackets are drawn around the core, I would pass on them.
If they have a gas check they will work but heavier cast bullets are better to hold down MV. I shoot a 180 grain cast bullet in the 300BO but it has a gas check to prevent the gas tube from filling with lead. 310 diameter is probably okay but you need to get a neck belling die to seat cast bullets correctly. The bullets will shave lead if you try to load them without a slight bell. I size mine .309 to reduce gas blowby. Make sure your necks are annealed so you don't split them when belling.
thanks for the responses. was going to load just for plinking ammo, low speed. but i think i will pass, just starting to load for this and think i will experiment in other directions.
The 125 grain TNT by Speer is a good one for the 300BO. I have also used 147FMJ's with complete success.
If you are using them in a gas operated rifle you need to be sure there is full protection of the lead to prevent fouling of the gas port in the barrel - a real PITA to clean out.