28 Nosler on a 700. Does it need to be an Ultra Mag action?

[Shawnba67]

Ive got a buddy asking about putting together a 28 on a 700 I found several posts on what magazine to use but didnt see if folks were starting with a reg magnum action or an Ultra.
If its the ultra how hard is it to open the feed rails on a regular mag to the ultra.( it may be cost effective to do/have done) I believe i read the ultra rails are .012 wider each side. Much research would be done before that.
Thanks much

 

[Dusty Stevens]

it really does need to be an ultramag. I haven't tried a regular magnum but I built a 33nosler in a hurry this year for myself on a 30-06 action and the case wont even drop thru the rails. its a single shot anyway with a follower but I was just checkin

 

[Sniper338]

Bigger aint gonna hurt and will most likely be best

 

[Danny1788]

I’ve built a few 28noslers on regular rem 700 magnum actions. One was a 300wm and 7mag to start. The feed rails only had to be opened a little bit. I used a fine file and layout fluid to remove material until the case barely slipped through at the base. I didn’t have to take much material off the front of the rails mainly the rear. Once the case fit through the rails I cleaned them up with a fine polishing stone and broke the edges so they wouldn’t scratch the cases.

I reused the regular magnum followers but did have to purchase the “ultra mag” mag boxes from midway USA they are $10.

If your reamer has longer FB then you can install a Wyatt’s box and adjust the feed rails the same way.

 

[bsaoneshot]

I’ve built a few 28noslers on regular rem 700 magnum actions. One was a 300wm and 7mag to start. The feed rails only had to be opened a little bit. I used a fine file and layout fluid to remove material until the case barely slipped through at the base. I didn’t have to take much material off the front of the rails mainly the rear. Once the case fit through the rails I cleaned them up with a fine polishing stone and broke the edges so they wouldn’t scratch the cases.

I reused the regular magnum followers but did have to purchase the “ultra mag” mag boxes from midway USA they are $10.

If your reamer has longer FB then you can install a Wyatt’s box and adjust the feed rails the same way.

Did the same thing on a Rem 700 7mm rem mag. Works fine!

 

[Shawnba67]

Thanks alot fella's.

 

[Alex Wheeler]

The feed rails and the feed ramp itself need to be opened up. The wyatts center feed cfe 12 box will feed the best.