I don't know if this is a new ideal or not. Is it possible to have the bolt lugs machined into the barrel. Wouldn't this basically remove all flexing in the action when the rifle is fired. I think I readed an article on this in one of my magzine this month.

It ain't new.

One of the many rifles made that way was the Sportco (Omark, Australia). They were/are a "sorta" 40-X short-action clone (.308) but with a 3-lug bolt which locks directly into the barrel. I currently have four of them...a M44, a M44 Palma, a M44D, and an experimental toolroom sample in .22 RF...all single-shot target rifles except the RF which was intended as a training rifle for the Canadian Forces.

ideal ?
readed ?

quote:

Originally posted by ikesdad:
ideal ?
readed ?

He asked a question; didn't post a claim as a skilled typist.

I reckon you're correct.

I am pretty sure thats the way the new switch bolt-barrel rifle is from TC. To switch calibers all you do is swap the barrel and bolt.

God Bless, Louis

If I understand them correctly then the Browning BLR bolt locks into the barrel also, thats how they get away with the aluminum receiver.

SSR

sauer 202,303 and blaser has used it for a long time.

Even the much maligned Remington 770 uses it. The Mauser 03 as well. There is no doubt it works and simplifies bedding. Also, the ideal platform for a switch-barrel.

AC, how do those Sportcos shoot?

Plenty good for high-power competition out to 1,000 yards with the right ammo. I've never tried to fit one out in a benchrest chambering and stock to try that application.

They DO accept Remington triggers if you use a .007" flat shim next to the Remington trigger housing body on one side (either side) to take all the sideways play out.

That means they will also accept any Jewell trigger without a safety which will fit a
Remington.

I used mine in DCRA "Full-Bore" competition (Hi-Power prone shooting). The Canadian (IVI '74) boat-tail military ball ammunition which was issued free of charge on the line and was mandatory for all competitors at that time, only averaged about 144 grain bullet weight and the bullets were on average about .306" diameter with VERY LITTLE bearing length. So, a person had to use a "tight-bored" barrel for good results at long range. Sportcos were intended for exactly that sort of thing, so they came with 14" twist barrels with a .2985" land diameter and about .306"-to-.307" groove diameter....worthless for 173 grain boat-tailed .3085" bullet diameter WRA ammo, but excellent for the Canadian stuff.

The Sportco barrels were good enough that later when I started using the Musgrave (South African) actions, I still installed Sportco barrels on them to earn my Master classification and to shoot on the national Palma Team. I finally switched to 1-in-14" twist .307" groove diameter Shultz & Larsen barrels which were even better.

I like the Sportco barrels well enough that I still have half a dozen brand new short-chambered but unfitted ones squirreled away. I take them out every year or so, clean the bores, check them, then re-oil them and put them away in their individual storage boxes.

BTW, the barrels I took off of the Musgraves were excellent for the American WRA 173 grain military ball as they were about .3082" groove diameter with a 1-in-10" twist, so I still have another half dozen or so of them put by too.

Unless I'm missing something the most common example is the AR-15.

quote:

basically remove all flexing in the action when the rifle is fired.

No, you can bend a receiver slightly by leaning on the stock with your face. What you are talking about may reduce it slightly but it will not eliminate it.

quote:

Originally posted by SR4759:

quote:

basically remove all flexing in the action when the rifle is fired.

No, you can bend a receiver slightly by leaning on the stock with your face. What you are talking about may reduce it slightly but it will not eliminate it.

Though it won't bend any easily measured amount on a Sportco...they have very thick receiver walls, a short action, a relatively small loading port, and nothing at all cut away for a magazine opening. They are mostly a very thick-walled high-strength all steel tube.

quote:

Originally posted by Alberta Canuck:

quote:

Originally posted by SR4759:

quote:

basically remove all flexing in the action when the rifle is fired.

No, you can bend a receiver slightly by leaning on the stock with your face. What you are talking about may reduce it slightly but it will not eliminate it.

Though it won't bend any easily measured amount on a Sportco...they have very thick receiver walls, a short action, a relatively small loading port, and nothing at all cut away for a magazine opening. They are mostly a very thick-walled high-strength all steel tube.

True but that has nothing to do with the locking lug arrangement. A 4OX Remington is difficult to bend too.
My point is if you lean on any receiver with your face you may change the point of impact.
The arrangement of the locking lugs does no eliminate that.
A huge single shot receiver is a different story.

quote:

Originally posted - True but that has nothing to do with the locking lug arrangement. A 4OX Remington is difficult to bend too.

The locking lug arrangement does not have a LOT of effect, but it can/does help stiffen the action if the action body has no "cut-out" locking lug recesses or locking lug raceways in it. In the Sportco action the lugs are the same diameter as the bolt body, so no action/bolt-lug raceways are required, and as the lugs lock into the barrel, no locking lug recesses are cut into the action either.

As those areas all remain solid steel of concentric diameters, action stiffness is increased....or, rather, not reduced by such cuts.