Can't make out exactly what is roll stamped onto the forward receiver ring in the photos provided. I have to mention, though, that more than a small number of Pattern 14's have been converted to cartridges with the H&H 'magnum' dimensions, as there are no bolt modifications needed because the bolt is set up to function with the larger .303 Brit rim. Magazine mods are about the same as for the 17, very little fiddling with the rails to get the rounds to feed, and depending on how the mag is modified, it can store five 'magnum' cartridges with no problem.
When I have them modified, I have the rear bridge cut so that the front and rear receiver rings match the same profile as a 700 Remington. Using two piece bases, and a fairly long bodied scope, it works out great.
Other things I like to do to these is to remove the pad that sits under the flat spring on the bolt stop, cut the spring, and add a piece of material to give some tension again, and also pull the flat spring ejector out, and replace it with one with a coil.
I leave the safety alone on these, and although they look odd, they function great. As to the bolt handle, I cut the ball off the end, heat and forge the bolt handle 'straight' from the first bend out. That gives it a fair sweep, then I taper the end, so that I can push the ball all the way onto the taper, and weld it back on. Gives just about a perfect length, plenty of clearance for a low mounted scope, and I've yet to get dinged by the bolt handles from recoil.
Also, after I've removed the spring pad from the bolt stop, I recontour that portion of the rear bridge to remove the hole that the pad uses to anchor, give it a nice contour, and quit fiddling with things after that.
One rifle that I did, I installed a side safety Timney trigger for an 03 Springfield on it, but then, after it was on, remembered that the stud on the front of the sear on the original trigger engages a slot in the bolt to keep the bolt from rotating out of battery when you fire the piece........
Whatever mods you make to one of these, it still ends up being a beast of a rifle, and you might as well go for .338 Winchester or larger. On a 17, I like to turn 'em into .35 Whelens.