I sighted in a new scope today on my 300wby.rem.classic and i tried some 150gr.weatherby ammo and some 220gr.remingtonRN ammo.Both shot great with the 220gr.hitting 2in. higher at 100yrds..150 gr. was dead on.Is this normall to be so close of zero with that much weight differance in bullets?Iam no expert on the 300wby.and iam just getting to know the cartridge,having fired less than a box.If this is the norm will the 180gr. hit in between or could this just be a good barrel that will shoot everything to pretty much same place?Can this happen?I thought the 220 would hit way higher but was glad to see how close it was..Anyone ever see this before?

Consider yourself lucky. I have a 300 Weatherby MKV and although the 220 Factory Weatherbys, 180 Partitions and Hornadys shoot close enough, they do so on the horizontal plane. A word of caution though. Be very careful with shot placement with the 150s at close range, they will flat explode if bone is hit. jorge

at 100 yards the 150's are probably still on the rise. Shooting at 200 will give a greater spread in the vertical with the 150's higher than the 220's. Personally I like the 165's in my three 300 Wby's for deer and similar sized game being a bit heavier and retaining more velocity/energy downrange. Thinking back I can't recall ever shooting two different bullet weights at one range sesson.

This is getting off the subject a little. I had a .270 BAR with the adjustable muzzle break. I set the brake at the recomended setting for 140's and never moved it. Thatdarn gun would shoot 130's; 140's; and 150's all to the same point of impact. Different brands of bullets didn't matter and fast or slow powder didn't matter. All this out of an automatic. Should have never sold that gun!

I guess the point is YES it can happen and you probably do have one of those unique guns we always hope to get when we open the box!

I tried to post this a couple of days ago and lost it when the network went down.

It's common to see heavier bullets shoot higher than lighter bullets at short ranges (like 100 yards) due to the muzzle rising higher from recoil while the bullet's still in the barrel. The movement of the rifle is roughly proportional to the bullet's travel in the barrel multiplied by the ratio of the bullet's mass to the rifle's mass. (That neglects the effect of the powder charge moving in the barrel.) The full calculations are presented in Hatcher's Notebook. The effect is especially obvious in handguns using heavy bullets in light guns, with the bore line well above the gun's center of mass and the center of pressure on the handgrip, but it's significant in rifles as well.

It'll vary quite a bit depending on how the rifle's supported, how hard the butt's resting against your shoulder, etc., which is why you need to recheck your zero in hunting positions after sighting in on the bench, and why somebody else can't sight in your rifle for you.

Hey guys,How does your 375H&H shoot with the 270grain and 300 grain bullets?What about the different weights in your other big bores?My 375 shoots the 270 and 300 to the same place.The speer nitrex 285gr. shoots even tighter...Bet if i tried the 250gr. or 235 it would change...Doesnt good bedding and good barrels do this and a barrel crown will effect groups?Will a real stiff barrel/heavy help in good groupings?I have always been kinda leery of a real lite barrel/pencil and never heard of a super accurate short carbine type rifle barrel?You know those contenders are pretty accurate little hunting pistols though.......

Yeah, the post I lost the other day rambled on at considerably greater length about bullets of different weights and velocities exiting at different points in the barrel's vibrational cycle, which might deflect it more on the target than the recoil motions I mentioned. Bedding problems can really exacerbate the vibrational motion effects and make them rather random. Short, stiff barrels don't move as much as long, thin ones.