Milling .45-70 case rim
I may pursue the idea of milling the case rim on the .45-70 to fit the bolt head of a Remington 7600. If that part can be accomplished, then I can look at the costs of a new barrel for the .45-70 cartridge and fitted to the 7600 action.
I will be checking to see if a clip magazine of the 7600 will accept a .45-70 round.
I have found a Remington 7600 pump chambered for .35 Remington. The case rim for the .35 Remington measures .460" compared to the .45-70's .608" rim. The case rim of the .30-06 measures .473". The question of a clip magazine accepting a rimmed case has been answered.
At this point, can you foresee anything that I'm over looking?
You can never have too many guns!!!
I will be checking to see if a clip magazine of the 7600 will accept a .45-70 round.
I have found a Remington 7600 pump chambered for .35 Remington. The case rim for the .35 Remington measures .460" compared to the .45-70's .608" rim. The case rim of the .30-06 measures .473". The question of a clip magazine accepting a rimmed case has been answered.
At this point, can you foresee anything that I'm over looking?
You can never have too many guns!!!
0
-
Without going into other reasons why I don't think this will work.
What is this case going to headspace on? I think expecting it to headspace on the mouth of the case is iffy at best.0 -
Following BT99's line of thought . . . .
Looking at the dimensional data, I see no way this could be accomplished. The .35 Rem rim is nominally .460" - only .002" over nominal bullet diameter of the standard .45 caliber bullet, so the only options to obtain a means of head spacing the new loading would be to have an even fatter case which is in turn necked down to .45 or to use a belted case. There may be some rebated head design out there which would work (I didn't spend a lot of time on this), but all the 'normal' basic case designs for .45 & larger have rims 0.040" or more larger than the Rem round. If you were willing to accept a .416 or .40, you could create some sort of wildcat based on the .35 case and still have a shoulder to work with. Faster & easier to run cases through forming dies than cut down brass on a lathe! Not cheap, though, as such dies typically will run $200+ in addition to the cost of the new barrel.0 -
Check to see that the 35 action bolt stroke is long enough to clear the 45-70 round and that also goes for the magazine. If you're stuck on length, you can base the cartridge on the 35 Rem case. You should still get 45-70 ballistics out of it. Sticking with your original good idea of using the 45-70, just rebate the rim a little further for the present. You can open the bolt face later if you want to. Headspace shouldn't be a problem unless the guy sinking the chamber goes too deep. There's no way you're going to force the case neck into the barrel throat.Remember most all autopistol cartridges and the 30 Carbine headspace on the case mouth and they really get pounded into the chamber. The machinist will need an accurate sample round to act as a headspace gage. If he goes too deep you're in trouble.
You may have to make a new magazine follower that fits the wider, straight case. With several dummy rounds you can check out any magazine problems. Check also if the rebated rims will be high enough for the bolt to pick them up. The nose of the fatter bullets must also be able to clear the magazine and be angled at the chamber. If not, you have to determine if bending or cutting back the feed lips will solve the problem. If magazine problems are insurmountable then the Remington 14 or 141 with tubular magazine might be an alternate candidate. With tubular magazine rifles, cartridge guides and maybe lifters may need modification.
The first step should be investigatory to make two sample dummy rounds and see where the extra width and different profile would cause a problem. This is where you should spend your first $20.
I would say this project should be a go.
If BT99 has some insight on unforseen problems it might be helpful to bring them out.0 -
v35,
Thanks for all of your input, much appreciated
I will be starting with a rough milling of a couple of .45-70 case rims to get them into the range of an '06 rim, then I'll check to see how they will or will not fit into a clip magazine.
I'll work from there if the cases will fit the magazine.
I'll definitely look at a pump action of the 7600 model in '06 or .35 Whelen caliber; longer case length and larger case rim than a .35 Remington.
As for the barrel, when the time comes and I find no feeding problems into an unbarreled action (we're thinking positive here ), I may call Remington and tell them to make me one.
Hey, I just had a thought (which are few and far between), I just may forward all of these posts (including the others under a similar topic) to Remington.
The Marlin lever actions are selling like gangbusters in .45-70 and they came up with their own round, 450 Marlin!
Remington can rebate the rim of the .45-70 (the .45-70 Remington) and work out the action to accept and chamber this classic round.
Until then, I have a project that will keep me out of trouble, off the streets and at my work bench where my wife can always find me.
Does anyone have Remington's email address?
You can never have too many guns!!!0 -
00, if you decide to go with a rebated rim, etc., may I suggest that as a matter of safety / peace of mind, you section one of the turned cases just to see how much "meat" is left after cutting in an extractor groove? Also, as with loading semi-auto rounds which headspace on the case mouth, you will want to pay close attention to the crimping operation, taper rather than roll crimping. 0
Please sign in to leave a comment.
Comments
5 comments