alleyyooper
For a Remington with a Cabels that is really normal. Most of the blowback is contained the nipple and the small primer is pushed back out of the battery cup. Both of mine do this consistantly.
The time to start reducing charges is if the bolt is blown back into the cocked position. If that occurs with a normal charge the spring is getting weak if occurs with a magnum charge 110+ then you will have to reduce the charge or the weight of the bullet.
mike