That was the last 5 rounds I had with the blitz kings loaded though so I couldnвЂ™t shoot a second group. Maybe I didnвЂ™t let the barrel cool between shots like I had the other groups or who knows what. It is still nothing to complain about but i actually thought they would out do the Noslers for some reason. Sierra blitzkings have always been interchangeable with the Nosler for me. This group was a little bit of a surprise to me. As I labelled the picture, its 5 rounds at 100 yards. The Nolser ballistic tip boat tail 55 gr bullet is a great bullet that seems to be impossible to shoot bad. You can see the 5 round group above, fired from 100 yards. The 55 TSX will work fine as it turns out but I wasnвЂ™t sure at the time and the bullets are very pricey so i went the safe route. So you even with a 55 grain bullet you may end up with a bullet a little too long for the 1/12 twist to stabilize. The TSXs are long for weight since they are solid copper. I selected the excellent Barness TSX solid copper hollow point for a deer load and it performs. He wanted to shoot a deer with the same gun he carried in Vietnam. This is one I came up with about 6 years ago with the exact purpose of using the SP1 for hunting by my Dad. The first group shot ( above) is also the newest load I have developed. I did shoot one group using M93 just to see, but since I wanted to test what the gun could do, I gave it the best ammo I had. Most of the ammo I used were hand loads I have developed over the years that have always given me great accuracy from bolt guns and semi autos.

I wanted to stay within what some one would have used at the time but wanted to be able to squeeze more out of the gun than irons sights would allow me. I put the gun up on bags and use the original Colt 3X scope I have mounted on the gun for shooting the groups. The twist rate means you wonвЂ™t be using any pet 69 or 77 grain bullets, but they didnвЂ™t really exist in its original day so your choices were simple. Like the SP1 carbine, the barrel is the 1/12 twist chrome plated ( bore and chamber) milspec barrel. The barrel is the same as was used on the M16 series. The SP-1, otherwise known as the Colt AR15 is essentially an M16 in all but the fire control group. ArenвЂ™t we lucky that we arenвЂ™t stuck with those old crummy barrels from the 60s? You got gold coloring, chamber dimensions that are a hybrid of the NATO spec chamber and civilian competition variations, different materials and methods and every contour and length you can think of. After all they do have everything man can devise to make them more accurate. Of course the internet and gun magazine experts always like to remind us how the original M16s didnвЂ™t impress when it comes to accuracy and you should totally feel good about paying 400 dollars for modern barrels.

The results got me thinking about the M16A1 and the accuracy it could deliver. Back in June I shot a vintage original Colt AR15 SP-1 carbine to see what kind of accuracy could be expected from one in good condition.

Colt ar 15 review