Gunsmithing Shimming the scope base on a 5R

[Bunnyblaster]

I just bought a 5R from a guy on gunbroker. He just send me this email:

"My advice is to purchase from brownells a package of brass shims ($12), now. They'll be there when the rifle is.
The top of a Remington receiver rear mount varies. You will need to shim the rear for your mount. Else when you tighten the screws it will bend the mount....I had one 700 that the attachment holes were out windage so bad I had to slot the weaver base in order to get it on the target, especially with the newer scopes. The rifle you purchased is good windage and only needs vertical change. If you use a 2 piece mt, it exaggerates the difference."


Anyone familiar with this? I haven't ever run into this issue on my rifles, but I don't have lots of them either. I had plans to install a 20 moa 1 piece base.

Thanks

Aaron

 

[Lowlight]

Re: Shimming the scope base on a 5R

The guy is probably 75 yrs old when they used to shim things... just buy a base that has a cant built in. and if you feel the receiver is out of spec you can decide to bed it without using shims.

 

[monteboy84]

Re: Shimming the scope base on a 5R

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Lowlight</div><div class="ubbcode-body">bed it without using shims. </div></div>

I recommend that regardless, since no two machined surfaces ever fit perfect. A properly bedded bases is completely stress-free, which will not only have the base fitting properly, but eliminate vertical stringing caused by improper fit of the base to the receiver.

-matt

 

[Bunnyblaster]

Re: Shimming the scope base on a 5R

I would probably are with you there. Before that email, I was asking him how he broke the rifle in, since he mentioned breaking in the rifle in his gunbroker add. His response was this:

"Many authorities do not believe a match barrel needs a breaking in. Not an authority, am I. But 13 gn Red Dot w/ 170 gn GCSWC cast was most of my shooting. Cleaned every 20 rds. Then jacketed 110 gn with 18 gn 4895 for about 20 rds. No more than 20 rds fired match Federal 168 gn HPBT. Then I stopped."

I've been reloading for a while, but I'm no expert. However, I have to believe he's got the first two loads mixed up with something for his handguns. A WC out of a rifle? With 13 grns of powder? What? Am I missing something?

 

[Bunnyblaster]

Re: Shimming the scope base on a 5R

Do you have any resources on how I should bed the base should I need to?

 

[deadeye]

Re: Shimming the scope base on a 5R

+1 on stress free bedding the base - I feel it isn't an option but a necessity.

If you've ever bedded a rifle stress free - it's pretty much the same procedure.

 

[Clark]

Re: Shimming the scope base on a 5R

I use narrow shims of masking tape to shim the mount to be parallel with the barrel or 20 moa tipped down in front.

Then I glass the mount to the receiver.
I have been doing that for 10 years with dozens of rifles.
I used to set it up outside with bore sighting during daylight, and keep the epoxy inside until mixed.

It got easier with Leuopld's magnetic bore sighter.
Now I can do it all inside and at night.

Getting a two piece mount co- planar and parallel to each other, either bore parallel or 20moa tipped, still takes skill.
My lazy kids could glass a one piece mount.

 

[former naval person]

Re: Shimming the scope base on a 5R

BB. The load mentioned will give about 1200-1300 fps with that lead bullet. I've used many 12 grains of Unique with a 200 gr lead for about 1000-1100. Quiet, accurate and deadly.

 

[beltfed74]

Re: Shimming the scope base on a 5R

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Bunnyblaster</div><div class="ubbcode-body">I would probably are with you there. Before that email, I was asking him how he broke the rifle in, since he mentioned breaking in the rifle in his gunbroker add. His response was this:

"Many authorities do not believe a match barrel needs a breaking in. Not an authority, am I. But 13 gn Red Dot w/ 170 gn GCSWC cast was most of my shooting. Cleaned every 20 rds. Then jacketed 110 gn with 18 gn 4895 for about 20 rds. No more than 20 rds fired match Federal 168 gn HPBT. Then I stopped."

I've been reloading for a while, but I'm no expert. However, I have to believe he's got the first two loads mixed up with something for his handguns. A WC out of a rifle? With 13 grns of powder? What? Am I missing something?



</div></div>

The Red Dot load is an old Ackley trick to fireform the cases to his Improved design.

 

[deanq]

Re: Shimming the scope base on a 5R

<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">I would probably are with you there. Before that email, I was asking him how he broke the rifle in, since he mentioned breaking in the rifle in his gunbroker add. His response was this:

"Many authorities do not believe a match barrel needs a breaking in. Not an authority, am I. But 13 gn Red Dot w/ 170 gn GCSWC cast was most of my shooting. Cleaned every 20 rds. Then jacketed 110 gn with 18 gn 4895 for about 20 rds. No more than 20 rds fired match Federal 168 gn HPBT. Then I stopped."

I've been reloading for a while, but I'm no expert. However, I have to believe he's got the first two loads mixed up with something for his handguns. A WC out of a rifle? With 13 grns of powder? What? Am I missing something?

The Red Dot load is an old Ackley trick to fireform the cases to his Improved design.</div></div>
You guys need to get out more!

That Red Dot load is a max cast bullet load....very nice to shoot all day!

 

[EXTREMEPREJUDICE]

Re: Shimming the scope base on a 5R

http://www.murphyprecision.com/Page/Scope_Base_Bedding This is just one method, there are others.................