Upward pressure on barrel ?

[JOHN COOK]

How do you check the upward pressure on the barrel ? ( upward fore end pressure on the barrel to within specified levels)

john

[Parashooter]

Observe amount of force (pressure or tension) needed to move barrel away from wood at forestock tip. Viable* methods include -
Educated thumb pressing up on barrel while fingers press on top of upper band.
Educated fingers pulling up on barrel while thumb presses down on band.
Applying bottom of muzzle to bathroom-type scale and pushing down on handguard or upper band.
Hooking fishing-type scale near muzzle and pulling barrel away from forestock tip.
Securing rifle upside down and hanging incremental weights from barrel
*None of these methods will work if the upper band fails to provide sufficient clearance for observable movement.

[Marine A5 Sniper Rifle]

I always found it funny that people will pay a premium for a "straight" barrel, then put it in a stock with 8 lbs of upward tip pressure, which bends the barrel.

jt

[Phil McGrath]

I always found it funny that people will pay a premium for a "straight" barrel, then put it in a stock with 8 lbs of upward tip pressure, which bends the barrel.

jt


Is it really a bend or more flexed? I bend will stay bent but flexed can spring back........

[Marine A5 Sniper Rifle]

Is it really a bend or more flexed? I bend will stay bent but flexed can spring back........

A bullet, going down a non-straight barrel, would not know the difference between bent and flexed.

jt

[PhillipM]

Question. Does 8# force exceed the modulus of elasticity of the barrel? If so, the barrel is "bent" if not, it is still straight.

[Marine A5 Sniper Rifle]

Question. Does 8# force exceed the modulus of elasticity of the barrel? If so, the barrel is "bent" if not, it is still straight.

It is not straight when in its stock. It may not be "bent", but straight it ain't! A long barrel can have quite a curve before exceeding it's MoE.

jt

[wolley]

The stock is deflected more than the barrel. And we all know these rifles generally shoot better with "some" pressure from the stock.
There is no magic number. It just needs "enough" and there is not an accurate way to measure it besides a calibrated MK1 hand.

[Motorcop]

In reality there are some 03's and 03A3's that shoot better with no barrel pressure, in reality almost free floating, than with any pressure at all. I know because I have two in my collection that are almost free floating and they shoot very well. I have others that require at least some pressure before they will perform. A smart 03/03A3 owner will do some testing and figure out what his rifle likes best. It's a little more work but well worth the effort.

Rick

[JOHN COOK]

Thanks for all the responses. I finally found my copy Of " The Book of the Springfield " by E.C. Crossman. On page 291 he goes into quite a bit of detail cocerning the improper fit and bedding a Springfield. Good book in my opinion but you must accept it was copyrighted in 1932. Some things probably have been found to be incorrect by now or the information has stood the test of time. The book I have still has the liibrary card in the sleeve of the front cover. It was signed out on FEB. 7 by D. T. Farley. Its rubber stamped (Property of U.S. Army), (Camp White ) ? , ( and Jan. 9 1947 Library, Letterman General Hospital, Presidio of San Francisce, Calif. A lot of information in this book.

john