Barrel advice 452 vs 458

[jlink]

I am in the process of having McGowan put a barrel on my 700ml for a smokeless conversion. When I started down this road I thought I needed a .452 barrel since I am planning on smooth sizing the bullet and shooting bullet to bore. But now after going down this rabbit hole should I have the barrel 450/458? or stick with 442/452? Thanks in advance.

 

[GM54-120]

A 442/452 will require FULL forming bullets. You want a 450/458 for smooth sizing.

 

[jlink]

figured that out, now. I thought about this way to much. I figured 458 would be to loose but I wasn't thinking about the land diameters.

 

[BuckDoeHunter]

What brand of breech plug do they use?

 

[jsteurrys]

It is good to have an option for those that still want to convert the old Remington 700 ML. Everyone else has abandoned them.

 

[jlink]

What brand of breech plug do they use?

They ask you to send in the action with your bolt and your choice of breech plug. I went with the Arrowhead nose kit and 209 plug.

 

[BuckDoeHunter]

Good info. My 700ML with a McGowen barrel was very accurate.

 

[alternate]

McGowen .458 in 1 x 18 twist.

 

[jlink]

I ended up going with the 1x22 twist after talking to Dennis at Fury asking him which twist he preferred for his 250/275gr bullets.

 

[HV-Muzzleloaders]

You can also shoot 10mm (.400 cal) 200 grain bullets in it with the Harvester 4540B High Pressure sabots using 85 grains of H4895 at about 2700 fps. I like the TC .400 bullets. You will be getting more energy than a 30-06 with this combination, but it may not be quite as accurate as the smooth sized bullets.

 

[brownisdown]

I have used the same bullet but with 60 grains of h4198 and hlbs.I believe it is around 2550 fps,not for sure though.I also have some 180 grain 10mm hollow points I want to give a try some day.

 

[HV-Muzzleloaders]

I have used the same bullet but with 60 grains of h4198 and hlbs.I believe it is around 2550 fps,not for sure though.I also have some 180 grain 10mm hollow points I want to give a try some day.

Where did you get the 180 grain 10mm bullets?

 

[brownisdown]

My brother and I went to a gun show here in Indiana.The guy is usually there about twice a month.I think I gave $17.00 for a 100 of them.

 

[jsteurrys]

I ended up going with the 1x22 twist after talking to Dennis at Fury asking him which twist he preferred for his 250/275gr bullets.

I did a final scope check yesterday morning with my 2 McRem .45s. They both have 1:22 .458 McGowen barrels. One is a 6 land and the other is an 8 land. I put (6) 250 gr Barnes T-EZs into a ragged 7/8" group 3" high dead center at 100 yards. Three shots from each gun alternating guns. I think I am ready for deer season in 2 weeks.