208 Amax's and tight bores do not mix

BountyHunter · #1 04-29-2007, 02:59 PM

Couple LR BR shooters are using the 208 Amax's and coming up with some interesting results. They have 6k of the best lots to test right now and an issue is being noted.

The amax has a slight pressure ring and is slightly over .308. IT DOES NOT LIKE tight bores and this is being proven in 3-4 guns.

One of the guys has a Broughton with a .3078 bore and it would not shoot them under 10". They lapped it out to .308 and cut off the end and recrowned. Shot several 5-6" groups last match with the same load.

The Hart barrels are a true .308 and seem to shoot them well. Tim North of Broughton is making a special barrel with a bore of .308 exactly that will be on one of the test guns soon.

Understand your bore and bullet dimensions and do not be afraid to change a bullet if it will not shoot. Many times it just might not be the barrel is BAD.

BH

davewilson · #2 04-29-2007, 08:40 PM

when they lapped out the barrel did it have any taper(smaller at the muzzle) or was it the same dia all the way?

BountyHunter · #3 04-30-2007, 02:50 PM

They had the same diameter and it even slightly belled at the muzzle which is typical of most none mftr lapping. Most gunsmiths just do not do enough lapping to be good at it like the mftr. That is why they cut off about an inch or so and recrowned it. Shooting 5-6" at 1k now, so it worked.

eddybo · #4 04-30-2007, 09:15 PM

Well I actually hope they dont "fix" these bullets as they are shooting great for me just the way they are. Shot my best 500 yd group ever using these in my .300wby today. Either these bullets shoot better than noslers or all the time I am putting in at the bench is paying off. Guess I don't have a tight bore.

BountyHunter · #5 05-01-2007, 06:59 AM

the fix is not going to be on the bullets, rather they might soon start recommendind a certain bore/land to groove diameter.

Just some info for guys that are jumping on them. Right now we know the early Broughtons might have problems with them but Tim is also making a true .308 bore barrel to test now.

If you have problems with them, call the barrel mftr and see what the true land to groove diameter is. if it is under .308, then it is simply incompatible bullet/barrel combo and try another bullet.

BH

bailey1474 · #6 05-01-2007, 07:36 AM

I had a tight bore, 4 groove Lilja chambered in 300 RUM that shot the prototype bullets great. Never shot it on paper past 500 yds but hitting milk jugs 900+ yds was pretty easy.

BountyHunter · #7 05-01-2007, 03:24 PM

Bill

I am talking the difference between 10-12" and 5-6" groups at 1000. If you are OK with 1 MOA at 1000 (most people are) then no issue, however if you are trying to squeeze the last bit of accuracy out, then you might or might not have a problem. If it seems that there is a problem, look at this first.

BH